Mason's user avatar
Mason's user avatar
Mason's user avatar
Mason
  • Member for 5 years, 10 months
  • Last seen this week
11 votes

What is an example of a proof by minimal counterexample?

8 votes

If $A$ is dense in $\Bbb Q$, then it must be dense in $\Bbb R$.

7 votes
Accepted

Proving convergence of a bizarre sequence

6 votes

Nice proofs of $\zeta(4) = \frac{\pi^4}{90}$?

5 votes

Collatz conjecture pattern (3n + 1 problem).

5 votes
Accepted

Meaning of the sign of a complex number

5 votes
Accepted

Are there infinitely many prime numbers of the form $p^2+4$ with $p$ prime?

5 votes

Do the parentheses around modulo matter

4 votes

Can we remove the absolute value from inequality $|a-b|<ε$?

4 votes
Accepted

Find a relation on $\{1, 2, 3\}$

4 votes
Accepted

How many integer solutions are there on an $n$ dimensional hypersphere of radius $\sqrt{r}$ centered at the origin?

4 votes
Accepted

Proving Set Equivalence Using Set Laws

4 votes

Is there an explicit irrational number which is not known to be either algebraic or transcendental?

4 votes
Accepted

Prove the equation $\left(2x^2+1\right)\left(2y^2+1\right)=4z^2+1$ has no solution in the positive integers

3 votes
Accepted

Is there an arithmetic function $\alpha(n)$ such that $\mu(n)=(\alpha*1)(n)$?

3 votes

How many numerical multiplications for the product of three matrices?

3 votes

How to derive relationship between Dedekind's $\eta$ function and $\Gamma(\frac{1}{4})$

3 votes
Accepted

Invention of calculus

3 votes
Accepted

Prove that $\lim_{n \rightarrow \infty} \sum_{k=0}^{n} \frac{1}{k!} = e$

2 votes
Accepted

Is the sum $\sum_{n=1}^{\infty}\frac{1}{1+n^2}$ irrational?

2 votes
Accepted

Will Math Ever Stop Using Paper?

2 votes

Taylor series of functions

2 votes

Is there an easy way to see that binary expansion is unique?

2 votes

Modular Arithmetic Proof on getting 103 from sum of 9's and 14's only

2 votes

Prove that $4| \sigma(4k+3)$ for each positive integer $k$

2 votes

How to factor $x^3+y^3-91$?

2 votes
Accepted

Is $e$ raised to an irrational number rational?

2 votes
Accepted

Is there a recurrence relation that describes the aliquot sum?

2 votes

Shortest Distance from point to a plane

2 votes
Accepted

The sum of two numbers a and b is ${\sqrt 18}$ and their difference is ${\sqrt 14}$ . How do I find ${\log_ba}$?

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